In respiration,pyruvic acid is

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(C) During glycolysis,which is the first step of respiration,glucose is broken down into two molecules of pyruvic acid. This process occurs in the cyt

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Broken down into two carbon fragments and $CO_2$

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(C) During glycolysis,which is the first step of respiration,glucose is broken down into two molecules of pyruvic acid. This process occurs in the cytoplasm and does not require oxygen. Following glycolysis,pyruvic acid undergoes oxidative decarboxylation to form acetyl-CoA (a two-carbon fragment) and $CO_2$ before entering the Kreb's cycle. Therefore,the correct description is that it is broken down into two-carbon fragments and $CO_2$.

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